Changeset 9771

From Riccardo Corsi, "in attach you'll find a patch to cleanup a little bit the (de)initialization code of QuickTime?? environment from the quickTime pluging.
It basically removes the static init() and exit() functions,and move them inside the observer class (the one that cleans everything up when the last media is unloaded).

It also add an extra check to clean up on exit if the QuickTime?? env is initialized, but no media is succesfully loaded / written (it might happens with streaming resources).